Magnetic-pulley separator.



J. PfBETHKE. MAGNETIC PULLEY SEPAR'TOR.

APPLICATION min 1m31. 191s.

Patented Dec. 3, 1918.

2 SHEETS-*SHEET 1 `1. P. BETHKE.

y MAGNETIC PULLEY SEPARATOR.

APPLICATION FILED JAN-31.1918.

Patented Dec. 3,1918. I

A 2 SHEETS-SHEET 2.

- lldliillllo mmm-mmm,

Specification ot Letters Tatent.

patented nee... a, iota application tiled lanuary ttl2 tutti. lteriatMatlab-ttt.

To all fwtmttit may' concern.:

Be it lrnownfthat l, JOHN l?. Burman, a citizen of the llnit'eld States,and resldentof Milwaukee, in the county of Milwaukee and @tate ofWisconsin, have invented new and useful llmprovements .in Magnetic-Pulley Separatore, of which thejfollowmg 1s a description, referencebeing had to the accompanylng drawings, which are a part of this lll ipulley type it has -been necessary to enlarge` speciticatiom Theinvention relates to magnetic separa tors and more particularly to that'class of separators in which a magnetic pulley or drum is used inconneition with a conveyer belt passing over said pulley or drum andcarrying the material to be separated.

.ltleretofore in'v separators of the magnetic or increasethe size of thedrum to increase the capacityof thefinachine. rlhe objectof 'the presentinvention is to provide a means used in" connection with the magneticpulley type of separator to increase the capacity of the machine for anygiven size of magnetic pulley and also to produce a machine of increasedetliciency..

A further object of the invention is to provide means by .which theseparation of magtti " terial to be separated. may enter, and'l which fnetic from non-magnetic material in the magnetic pulleytype-of-separator is more positive than that heretofore used.

Another object of the invention is to providean extenf'ded magnetic heldahead of the magnetic pulley for the purpose of magnetically chargingthe magnetic material before it comes within the sphere of magneticinfluence of the magnetic pulleyto thereby oven.

come the initial reluctance ofthe magnetic 'material and thus facilitateits separation from the non-magnetic material while pass ing overthemagnetic pulley.

Another object of the invention is'to utilize for magnetin separationthat part of the nlagneti'fy Held of thermagnetic drum or pulley whichlies between the 'upper and lower portions of the conveyor-belt.

IAnother purpose of the Ainvewtion lis to provide an extended lield intowhich the mais. ahead of the magnetic drum or pulley to produce a`downward pull on the magnetic particles as they pass over the belt andalso having a tendency to turn these magneticA particles so that theirpoles will be transring v l2;

verse of the conveyer belt to insure a positive separation.

rlhe invention further consists in the several features hereinaftersetforth.

ln the drawings;

.Figure l isa plan view of the magnetic `separator embodying theinvention;

ley and of the separator-showing a .different l arrangement of the coilsfrom that of lFig. l;

. Fig. 8' is a section taken'on the line 8-8 .of

-liig 7;

'llhe magnetic pulley 8 is of usual construction and is mounted upon theshaft 9. rllhis pulley is provided with a series of disks i0 mountedupon the shaft 9 and serving as pole pieces. Coils l0 mounted upon theshaft 9 between said pole pieces are so wound that the pole pie'es willbe of alternate op posite polarity as indicated in Figs. 3, 6 and 8 andsaid coils are each surrounded by rings ll preferably of noiigmagiieticmaterial to serve as a protection for the coils. rlhe shaft 9 isprovided at one end with the usual tollector ring l2 for conveying theenergizing current to the coils 10 of the pulley and said current isconducted through live wires ll to brushes l2 'bearing upon 'thecollector A belt llt. preferably `of rubber or other non-magneticmaterlaltserves as Va conveyer for' the material to be separated. 'themate-v rialis fed to said beltthrough a hopperd or any other suitablemeansl 'l`he belt ea# tends over the magnetic pulley 8, and also overapnlleyor drum' 16. rlFhe shafts of thesegpulley's 8 and ltiaresupportedin any suitable mannerand the shaft 9' isrotated from anysuitable source of power, the shaft 9 being rotated to move the beltforwardly to carry the material upon thev top of the conveyer over themagnetic pulley. its is usual in mafliines of this kindthe non-magneticmaterial drops vertically 'from the lllll.

lldll..A

outer surface of thebelt while passing over the magnetic pulley whilethe magneticmaterial adheres to the belt 'until it moves out of contactwith the. lower` portion of the pulley and as the belt itself is ofnon-magnetic material, the magnetic material will drop therefrom into areceiver (not shown) immediately after the belt leaves the pulleysurface.

With the usual type of magnetic pulley separator, the pulley aloneaccomplishes the separation but when said pulley is run at a high speedto increase the capacity of the machine I have found that the materialcannot be magnetically charged quick enough for a given size of pulleyto accomplish efiicient magnetic separation and consequently forincreased capacity the size ofthe magneticlpulley vwould have to beincreased.

To overcome this difficulty, I provide `,a magnetic eld ahead of thepulley into the magnetic iniuence of which the material-to be separatedcomes before it passes over the magnetic pulley whereby the capacity ofthe machine is increased for any given size of pulley and also theseparation efficiency of the :machine increased.

In Figs. 1 to 4 inclusive this magnetic field is created by auxiliarypole pieces 17 which are of like polarity to the adjacent pole piecesJof the magnetic pulley. The ends 18 of the auxiliary pole pieces nearestto the magnetic pulley are shaped to conform to the surface of themagnetic pulley so as to provide an` uninterrupted magnetic zone. vThese pole pieces 17 have pole shoes or polar projections 19 lyingbeneath the belt and extending lengthwise thereof and core portions 20which are'connected together at their lower ends by a yoke'21'whichserves tol complete the magnetic circuit. Coils 20 lsurrounding theccries 2O are provided for energizing the auxi ry pole pieces and are sowound as to magnetically charge the pole pleces so that they will be ofalternate oppo- Asite polarity and of like polarity to the poles' of themagnetic pulley adjacent to them. These coils are shown connected upinseries with each other and through wires 21 to Athe live` wires 13though they may be sepa- .'rately energized or connected up to adifferent source of current than that for the pulley, as -will bereadily understoodby those skilled in this art.

With this construction the energizati'on of the coils produces amagnetic field' ahead of the pulley as the magnetic lines of force passfrom `one polar projection to thev other of opposite polarity, saidlines of force creatlng a magnetic field above the belt ahead of the,pul ey which draws downthe` magnetic materla '-into close contact withthe belt, and

lalso magnetically influences the magnetic material -before the materialenters the magnetic field produced Vby the pulley and there- 1,ase,511

yovercome by the usual magnetic pulleys nor can the reluctance of thematerial be overcome.

In Figs. 5 and 6 I show auxiliary pole pieces 22 which are of similarpolarity to that of the adjacent pole pieces of the magnetic pulley.Theends 22 of these pole pieces nearest the magnetic pulley are ofconsiderable area and are shaped to conform to the surface of themagnetic pulley. In this construction no magnetizing coils are used butthe magnetic field along the rear f surface of the pulley is used toinduce magnetism in the pole pieces 22. These pole pieces 22 have theirsides 23 tapered so as to converge the magnetic lines of force to- Wardtheir tops 24 and to provide against loss between the surfaces. Themagnets 22 are held in position between the upper and lower portions ofthe belt 14 by means of rods 2-1 which may be secured t0 any suitablesupport.

In Figs. 7 and 8 I show another magnetic field formed by vpole pieces 25similar to the pole pieces 22 just described and of similar polarity tothe adjacent pole pieces of the magnetic pulley. 'These pole pieces areenergized by horizontally disposed coils 26 whichare provided with cores27 extending vbetweenthe pole pieces and a supporting rod or shaft 28 isused to carry the coilsv and pole pieces. The coils are connectedv upinanv suitable manner to a'source of current.

- fore permit of running the pulley at a higher speed, and with/betteror more positive results because of the more thorough saturation of thematerial. This action further has a tendency to turn the magneticparticles on the belt so that their poles will be transversely of thebelt to insure a more positive separation, as for instance if themagnetic material is in the form of a rod when the rod runs lengthwiseof the belt it is apt to` i fall ofi the pulley along vvith thenon-magnetic material, but when it isturned transversely of the belt itWill be held until the belt leaves the pulley.

It Will also be noted that in all the forms here shown that part of themagnetic field of the'niagnetic drum Which'lies between the upper andlower portions of the conveyer belt is utilized to produce an inducedmagnetism in the auxiliary magnets and this is particularly true of theconstructions shown in Figs. to 8 inclusive.

lio

.. said 1 i am aware that the particular`constructions' herein shown anddescribed lare ca pable of some changes and l therefore de- --sire it tobe. understood that .such variations` in constfruetion .-a's come Withinthe scope of theiappended'elaims I deem to .be Within the spirit Q f'rnyintention.

What (I'claiina invention is: *1. ln an annular'magnetic separator, thecombination With a magnetic pulley having magnetic poles of alternateopposite polarity and a `conveyer running over said pulley;

of auxiliary magnets having poles disposed immediately adjacent thepoles of the magnetic pulley andl being of similar polarity to saidpoles, said magnets being disposed beneath the conveyer directly -infront of the pulley, and means for energizing said magnets.

2. In a magnetic separator, ythe combination With a magneticY pulleyhaving verti' callyl disposed magnetic poles of alternate oppositepolarity and a -belt running over said pulley, of auxiliary magnetshaving poles extending lengthwise 'of the belt and disposed beneath theupper run of the belt immediately adjacent `the magnetic poles of saidpulley and bein'gof' similarpolarity to energizing said oles, and meansfor auxiliary magnets.

.disposed immediately adjacent the poles of said magnetic pulley andbeing of similar polarity thereto, said auxiliary magnets being disposedin front of the pulley betweenthe upper and lower run of the belt andWithin the magnetic influence 4of the pulley and having a portion of thepole pieces disposed beneath ,the belt and in closeproximity thereto,and means for energizing said auxiliary magnets to create'a magneticfield ahead of the magnetic pulley to facilitate separation of themagnetic from the nonmagnetic'material carried by the belt.y

.4. lin a magnetic separator, the combina`` tion, with a magneticptrllegflzl having spaced apart annular polejpieces and coils interposedbetween said'pole pieces to energize said pole pieces so that they willbe of alten nate opposite polarity anda belt running j over said pulley,of auxiliary magnets having polar projections' disposed directly beneaththe, upper run of the belt in close proximity to said pulley7 saidpolarY projections being disposed in line with the `pole pieces of themagnetic pulley and being of similar polarity `and inuenced thereby,.and coils for energizing said auxiliary magnets 'to create-a magneticfield ahead of that created by the magnetic pulley to overcome themagnetic reluctance of `themagnetic material passing over the beltbefore said Vmaterial enters-.the magnetic field of the pulley.

ln testimony whereof l aiix my signature.

' JOHN P. BETHKE. p

